Horsetail Tree
| Casuarina equisetifolia | |
|---|---|
| |
| Casuarina equisetifolia subsp. incana | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Fagales |
| Family: | Casuarinaceae |
| Genus: | Casuarina |
| Species: | C. equisetifolia
|
| Binomial name | |
| Casuarina equisetifolia | |
| Subspecies | |
|
C. e. subsp. equisetifolia | |
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Casuarina equisetifolia, or Australian pine tree, is a she-oak species of the genus Casuarina. The native range extends throughout Southeast Asia, Northern Australia and the Pacific Islands; including Thailand, Burma, Vietnam, Malaysia, Brunei, Indonesia, Timor-Leste, and the Philippines (where it is known as agoho pine), east to Papua New Guinea, French Polynesia, New Caledonia, and Vanuatu, and south to Australia (north of Northern Territory, north and east Queensland, and north-eastern New South Wales). Populations are also found in Madagascar, but it is doubtful if this is within the native range of the species. The species has been introduced to the Southern United States and West Africa. It is an invasive species in Florida, South Africa and Brazil